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| Section | Weight | Objectives |
|---|---|---|
| WLAN High Availability and Security Design | 20% | - Security architecture design
- High availability design
|
| Mobility Design | 25% | - Mobility architecture models
|
| Wireless Infrastructure Design | 30% | - Wired-wireless integration design
|
| Wireless Site Survey | 25% | - Pre-deployment survey and validation - RF propagation and attenuation analysis - Layer 1 site survey execution and analysis - Design requirements collection and constraint evaluation
|
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NEW QUESTION # 80
A customer has two Cisco Catalyst 9800 Series WLCs named WLC-A and WLC-B in an N+1 configuration with the same WLANs but different Layer 3 interfaces for each WLC, and APs in local mode. WLC-A manages Building A APs and WLC-B manages Building B APs. The customer wants users to remain connected and retain their session state including the IP address when moving between buildings. How must this requirement be incorporated into the design?
Answer: B
Explanation:
The requirement for users to retain their session state and IP address when roaming between buildings managed by different WLCs is a Layer 3 roaming scenario. In Cisco's wireless architecture, IP address preservation across controller boundaries is achieved through inter- controller mobility -- specifically the foreign-anchor mobility tunnel mechanism. When a client roams from Building A (WLC-A) to Building B (WLC-B), WLC-B becomes the foreign controller and WLC-A becomes the anchor controller. WLC-B tunnels the client's traffic back to WLC-A, allowing the client to retain its original IP address even while physically associated to an AP managed by WLC-B. This requires a mobility tunnel between WLC-A and WLC-B with both controllers configured in the same mobility group name -- the group name is the trust identifier that permits the mobility tunnel and anchor- foreign relationship to form. Without the same group name, the controllers will not form a trusted mobility peer relationship.
NEW QUESTION # 81
An engineer must configure the virtual IP address on multiple controllers in a mobility group. Which rule must the engineer follow to ensure proper roaming?
Answer: D
Explanation:
In a Cisco wireless mobility group, all Wireless LAN Controllers (WLCs) must be configured with the same virtual IP address to ensure proper roaming. The virtual IP address is a Layer 3 construct used by wireless clients during the DHCP renewal process when roaming between subnets managed by different WLCs. All WLCs in the same mobility group use the same virtual IP (typically from the unused 1.1.1.0/24 or similar non- routable space) so that clients receive consistent DHCP server responses regardless of which controller they are associated with. If different virtual IP addresses were used (Option B), clients roaming between controllers would experience DHCP failures during inter-controller roaming because the DHCP server address seen by the client would change. Options A and C relate to DNS hostname configuration, which is useful for AP discovery but does not affect the roaming behavior of client devices. The virtual IP address consistency across all mobility group members is a fundamental requirement for seamless inter-controller roaming. Reference: WLSD Study Guide - Mobility Group Configuration, Virtual IP Address, Inter- Controller Roaming Requirements.
NEW QUESTION # 82
A hospital has a Cisco Catalyst 9800 Series Wireless Controller in an SSO solution deployed in the primary data center. The hospital plans to increase redundancy in the wireless environment. Management decides to deploy an extra Catalyst 9800 WLC offsite to another data center on a different subnet. A WAN link connects the data centers with a firewall at both ends. Which two design approaches must the engineer take to ensure that the APs can fail over? (Choose two.)
Answer: A,B
Explanation:
For APs to be able to fail over between a primary SSO pair in one data center and a standalone WLC in a remote data center connected via WAN with firewalls, two design requirements must be met. First, a mobility tunnel must be created between the wireless controllers (Option A). The mobility tunnel enables the controllers to exchange mobility control messages, peer information, and eventually AP context when failover occurs. Without the mobility tunnel, the remote WLC is not recognized as a valid failover target by the APs through the mobility domain. Second, UDP ports 16666 and 16667 must be open through the firewalls between the controllers (Option D). UDP port 16666 is used for mobility control traffic and UDP port 16667 is used for mobility data traffic - both must be permitted through the firewalls at both data centers for the mobility tunnel to establish and function. HTTPS port 443 (Option B) is used for web management and API communication, not for mobility tunneling. A static RF group leader (Option C) is a RRM configuration unrelated to AP failover capability. Creating a mobility group with the same names (Option E) is a component of the configuration but alone is insufficient without the mobility tunnel and open firewall ports. Reference:
WLSD Study Guide - Inter-Site WLC Failover Design, Mobility Tunnel Requirements, Firewall Port Planning for WAN-Separated Controllers.
NEW QUESTION # 83
An engineer is performing an AP-on-a-stick survey and finds that the 5 GHz channel overlap is too high when an appropriate number of APs are used for the density requirements. Which two actions during the survey reduce channel overlap? (Choose two.)
Answer: D,E
Explanation:
Raising the minimum data rate to 24 Mbps reduces the effective coverage range of each AP because clients at the cell edge operating at low data rates are effectively excluded from the cell.
This shrinks cell size, reducing channel overlap between neighboring APs on the same channel.
Using directional antennas limits the coverage area of some APs by focusing RF energy in specific directions rather than radiating omnidirectionally, which directly reduces the lateral overlap between adjacent APs.
NEW QUESTION # 84
The wireless team must configure a new voice SSID for optimized roaming across multiple WLCs with Cisco 8821 phones. Which two settings accomplish this goal? (Choose two.)
Answer: C,D
Explanation:
For optimized roaming across multiple Wireless LAN Controllers (WLCs) with Cisco 8821 IP phones, two critical settings must be configured. First, configuring mobility groups between WLCs (Option A) allows for seamless inter-controller roaming by establishing mobility tunnels between controllers, enabling them to share client security context, preventing re-authentication when a phone roams from an AP on one WLC to an AP on another. Second, using Cisco Centralized Key Management (CCKM) for authentication (Option B) reduces the time required for re- authentication during roaming from a full 802.1X exchange to a single-message re-key process.
CCKM stores the wireless security keys at the WLC level, enabling rapid key re-derivation during roaming without contacting the RADIUS server.
NEW QUESTION # 85
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